Mytrofanov A. Increasing efficiency of synthesis-gas usage in reciprocating engines

Thesis deals with the problem of increasing the effective and improved environmental performance piston engines running with alternative fuel - synthesis-gas, through experimental research and rational organization of the combustion process. Analyzed and identified the most promising ways to improve the performance of spark ignition engines using synthesis-gas. The obtained experimental indicator diagram and load characteristics of engines with spark ignition 4Ч 8,2/7 and 2Ч 7,2/6, with different coefficient of excess air 1...2,2 working on the synthesis-gas and hydrogen. For the mathematical simulation of the cylinder volume 240...500 cm3 spark-ignition engines of based on the analysis and processing of experimental indicator diagrams of engine working on hydrogen and synthesis-gas, have been proposed equations to find the values of the combustion parameter in semi empirical equation I.I. Wiebe. The proposed equations take into account the content of hydrogen in the synthesis gas within 30...100 % in volume and the excess air coefficient 1...2,2. The proposed equations for finding and in semi empirical equation Wiebe substantially improved the accuracy of the calculations in the simulation and allows achieve maximum mean square error of determination of the pressure in the cylinder and the definition of indicator parameters engine within 5...12%. Practical recommendations for setting up the fuel equipment, method of mixing, variable valve timing, which allow you to convert existing and new engine design to make effective use of synthesis-gas. Using the adjusted valve timing allows increase in engine output by using synthesis-gas by 5,3%, while the use of internal mixing of 9,7%.